Malicious PDF — malware analysis report

Static analysis result for SHA-256 6122d08ce79502d4…

MALICIOUS

PDF

34.9 KB Created: 2021-06-27 22:36:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 519d10da38f1f09d7defde0f4f9a19d4 SHA-1: fc4306a5d85824a55fabaee6dd294166823d939f SHA-256: 6122d08ce79502d476708fd92b5aa8865c5bc360551d7a29e38dee16133f96fb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs promising Roblox hacks and free Robux. The ML classifier and PDF SEO link farm heuristic indicate a high likelihood of malicious intent, likely to distribute malware or engage in phishing. The presence of 'cmd_GM431946152.pdf' in the document text suggests an attempt to disguise malicious commands or executables.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.co/app/431946152/roblox-hack-2021-free-robux-pc-game-hack PDF link annotation
    • http://pustaka.fkm.unand.ac.id/repository/cheat-roblox-tower-defense_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-roblox-gift-card-codes-list-2021-updated-weekly_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/is-there-any-way-to-gte-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/roblox-robux-hack-generator-survey-and-no-download_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/roblox-ninja-head-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/how-to-hack-roblox-accounts-2021-using-cmd_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/roblox-phantom-forces-mod-free-weapons_GM431946152.pdfIn macro / runtime command snippet
    • http://pustaka.fkm.unand.ac.id/repository/comment-hack-quelquun-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-fish-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/roblox-ben-10-universal-showdown-cheats_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/all-roblox-free-tails_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/can-you-generate-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/hack-mining-simulator-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/roblox-games-to-play-online-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repository/roblox-hack-2021-for-all-games_GM431946152.pdfIn PDF document text
    • http://pustaka.fkm.unand.ac.id/repositorIn macro / runtime command snippet
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000302f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302F 22368 bytes
SHA-256: 2e624ab9c183a03219343007bd42ba6990dd6df3f4e1ed691d5dfa30c63baa27
font_01_sfnt_off00006225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6225 19516 bytes
SHA-256: 697ad2601a8cdbda89317805f3d1b90df82855344d84cf988b5d617b56a9acad

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